Thanks Ryan for letting me know! Do you have an estimate of when lammps
will support kim-api-v2, like in a month or in six months or a year from
now?
I really hope it will be one month; we'll need to see how the start of the academic semester goes...
BTW, how should periodicity be controlled in the simulator, i.e. how can I
switch from a non-periodic system to a periodic system in say the
x-direction?
That is something that is essentially fully controlled by the simulator. The simulator must use non-contributing particles with kim-api models to emulate periodic-boundary-conditions. So, to simulate non-periodic BC's in one direction it would just not provide non-contributing particles surrounding the contributing particles in that direction. Each simulator will generally have its own way for the user to set the BCs in the various directions.
Ryan